Search plants, projects, owners, and states
200 MW BESS operating in Imperial, CA — California Independent System Operator
200 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
32.7334, -115.7137
County
Imperial, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Big Rock ESS Assets, LLC | — | — |
| Owner(s) | Big Rock ESS Assets, LLC | — | — |
| Status | Operating | — | — |
Big Rock Solar Farm is a 200 MW battery energy storage system (BESS) located in Imperial County, California. The facility, owned and operated by Big Rock ESS Assets, LLC, commenced operations in 2025. It consists of a single generator utilizing batteries as its primary fuel source, with a storage duration of one hour.
The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Big Rock Solar Farm ranks as the 63rd largest energy storage facility in California out of 112, and 311th nationally out of 514.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−2.0K MWh
Net Charging
-14.6K MWh
Annual Net Energy
-1.2%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $272.2M
Market Position
ISO/RTO Market
CAISO
LMP Node
WESCAN_7_N002
Pricing Hub
TH_SP15_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
Last updated 2026-04-19
View all 5 articlesNo ask pi reports yet for this entity.
ask pi about Big Rock Solar FarmCalifornia Independent System Operator (CISO)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP